Ealhswith or Ealswitha (died 5 December 902) was the wife of King Alfred the Great. Her father was a Mercian nobleman, Æthelred Mucil (or Mucel), Ealdorman of the Gaini, which is thought to be an old Mercian tribal group. Her mother was Eadburh, a member of the Mercian royal family, and according to the historian Cyril Hart she was a descendant of King Cenwulf of Mercia.

The calendars quoted here provide an early source for 5 December as the day of death. (Under the month of December from the Galba MS: "Quinta tenet veram dominam Angloram Ealhswithe." From the Tiberius MS: "Quinta tenet ueram dominam Anglorum Ialhswithe caram.")